Google’s blogging platform has a new feature added on 29th Nov 2007,
Blogger now supports openid commenting.
This means that if you are a blogger / google account holder or if you have an openid you can use it for commenting on any blog in blogger/blogspot.
for author’s in order to enable this feature you ned to change your setting’s.
Currently it only supports users to comment on blogger blog’s
but google is taking feedback from users and is planning to let them use thier blogspot url or custom domain url as openid. in other words it will be providing openid based facility for all blogspot users.
you can have more information about this at the official blogger’s blog here.